Intermittent Failure on Serial Port

[Serge Orlov]

H J van Rooyen wrote:
> Traceback (most recent call last):
>   File "portofile.py", line 232, in ?
>     ret_val = main_routine(port, pollstruct, pfifo)
>   File "portofile.py", line 108, in main_routine
>     send_nak(port, timeout)      # so bad luck - comms error
>   File "/home/hvr/Polling/lib/readerpoll.py", line 125, in send_nak
>     port.flush()
> IOError: [Errno 29] Illegal seek
> close failed: [Errno 29] Illegal seek
>


> Where can I find out what the Errno 29 really means?
> Is this Python, the OS or maybe hardware?

It is from kernel: grep -w 29 `locate errno`
/usr/include/asm-generic/errno-base.h: #define   ESPIPE          29
 /* Illegal seek */

man lseek:

ERRORS:
        ESPIPE fildes is associated with a pipe, socket, or FIFO.

RESTRICTIONS:
        Linux  specific  restrictions:  using  lseek  on  a  tty device
returns ESPIPE.